# How do I tell HMRC about unpaid crypto tax?

Use HMRC’s voluntary disclosure service for crypto on gov.uk. Calculate tax, interest and penalties for each year (4, 6 or 20 years depending on behaviour). Pay within 30 days of acceptance.

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— Digital Assets UK (https://digital-assets.co.uk/answers/voluntary-disclosure-crypto-hmrc/), reviewed 2026-06-23.